Method for producing drawn cups with faced and beveled edges



M' E7 E5 ll?! /14// E H. H. HUBBARD HOD FOR PRODUCING DRAWN CUPS WITHCED AND BEVELED Filed NOV. 6, 1941 June 8, 1943.

' the end thereof accurately faced away, to illustrate the cup andproviding the flared end thereon;

Patented June 8, 1943 METHOD FOR rnopucmo DRAWN curs WITH FACED ANDBEVELED EDGES Henry H.

ascignor Hubbard, Grosse Pointe Farms, Mich to Electromaster,

Inc., Detroit, Mich" a corporation of Michigan Application November 8,1941, Serial No. 418,029

1 Claim.

My invention bombs. Such cups are cylindricaland must have to be in adiametral plane, and the inner edge must be accurately beveled.Heretofore in the manufacture of such cups, at least three operationswere necessary. In the first operation the cup is drawn from a sheetmetal blank, then in a second operation the end of the embryo cup is cutoff for the desired depth of the cup and the end is machine faced, andthen in the third operation the inner edge is beveled off to leave aface of the required width. Such prior procedure thus requiresconsiderable time and machine work, and the important object of myinvention is to provide a method for more economically produc-,

ing a cup of this type, operations.

In accordance with my improved method, the first operation comprisesdrawing an embryo cup preferably by only two from a sheet metal blankaround a cylindrical die block having a frusto-conical end so endportion of the cup that the metal will be flared outwardly to the angleof the desired bevel. The second operation comprises the mounting ofthis embryo cup on another die block with a frustoconical end and with acylindrical shearing block secured thereto below the frusto-conical endwith its outer cylindrical surface in alignment with the outercylindrical surface of the cup body, and then passing a shearing ringalong the outside of the cup body for cooperating with the shearingblock to cut off the flared end and at the same time force the cup endintimately against the frustc-conical part to accurately form the bevel.

My improved method will be more fully understood by reference to thedrawing, in which:

Figure 1 is a diametral section, with part broken the first operation ofdrawin Figure 2 is a diametral section illustrating the secondoperation, the shearing ring being about to engage'with the outside ofthe flared cup end;

Figure 3 is a section like Figure 2 showing the shearing operationsubstantially completed;

Figure 4 is an enlarged view of the assembly for the second operationshowing the shearing ring about to start its cutting and formingoperation;

Figure 5 is a section similar to Figure 4 showing the shearing ringstarting its out and the forcing of the flange or flared end portionmetal against the beveled end of the die block: and

Figure 6 is a section like Figures 4 and 5 showing the surplus metalabout to be sheared oil for completion of the cup.

Referring to Figure 1, the die block A for the first operation comprisesthe cylindrical body IO and the frust'o-conicai end I I, the angle ofwhose outer surface I! accords with the angle of the desired bevel onthe cup. The outer or forming die member B engages a blank of sheetmetal and forces it around the die block A to form the cylindrical body13 of the cup, the lower end of the forming die member B thencooperating with the frusto-conical end H of the block A to flare outthe end portion ll of the cup. metal with its inner face intimatelyagainst the outer side of the frusto-conical end to define the desiredangle of bevel. The forming die member B is then removed and the embryocup is ready for the second operation.

For the second operation, the embryo cup is mounted on the die block Cwhich has the cylindrical body l6 and the frusto-conical end i'l. Se-

one corner of cured to the die block C concentric therewith is theshearing block D the diameter of whose outer surface is substantiallythe same as the outer diameter of the cup body it.

Referring to Figure 1, after drawing of the cup on the die block A, thebeveled outer surface of the frusto-conical end II is in intimateengagement with the inner 'side of the flared end portion l4 and withthe comer between the die block body and the frusto-conical endcoincident with the inner corner of the cup between its body part andthe flared end portion. Referring to Figure 2. the overall height of thedi block C is the same as the overall height of the die block A, but thedistance between the top of the die block C and the comer between thedie block body and its frusto-conical end I1 is slightly increased sothat the corner body and the frusto-conical end is slightly outside ofthe inside comer of the cup between its body and the flared portion M.The bevel angle of the frusto-conical portion ll remains the samebetween the die block II will be radially inwardly of the upper edge ofthe shearing block D to leave the annular forming seat IS on theshearing block D, the radial width of this seat being the desired widthof the end face 20 for the finished cup.

Cooperable with the shearing block D is a shearing ring 2| whose innerdiameter is substantially the same as the outer diameter of the cup bodyI 3. After mounting of the embryo cup on the die block 0, this shearingring is moved downwardly, by any suitable mechanism, along the cup body,and a holding pad 22 is also brought down by any suitable means, againstthe cup bottom to hold it securely and snugly on the die block C.Figures 2 and 3 show the shearing ring about to engage its shearing edge23 with the upper end of the flared portion H of the cup, and Figure 5shows the movement of the shearing ring in engagement with the flaredportion. The pressure of the shearing ring against the outer slantingside of the flared portion Hi will involve a vertical component towardthe shearing block D and a horizontal or radial component toward the dieblock C, the resultant pressure against the flared portion l4 causingthe metal of this portion to be progressively forced in toward the dieblock C and its frusto-conical end, as indicated by Figure 5, and tocause the metal to completely fill the space ill, the final movement ofthe shearing ring 2|, as indicated on Figure 6, cutting off the surplusmetal or trim X by the cooperation of the cutting edge 23 of theshearing ring 2| with the upper or cutting edge of the shearing block D,and after this trimming operation the cup will be finished, as indicatedon Figure 3, the cup being then cylindrical throughout and having theaccurately formed and finished bevel 24 and the accurately finished endface 20.

The shearing block D is preferably detachably secured to the die blockC, as by screws 28 to faciiitate die construction and to enablereplacement of the shearing block D which will have a tendency to wearat the cutting edge after a period of use.

I thus provide a very emcient method for economically and accuratelyforming cups with very accurate and exact bevel and end face finish. Ido not desire to be limited to the exact procedure shown and describedas changes and modifications may be made without departing from thescope of the invention.

I claim as follows:

The method of producing a drawn cylindrical cup with its edge portioninternally beveled and terminating in a base surface in a plane at rightangles with the cup axis, which comprises first die drawing a sheetmetal blank to form an embryo cup with a cylindrical body and a flarededge portion with frusto-conical inner and outer surfaces, then mountingthis embryo cup on a die block structure having a frusto-conlcal surfaceparallel with but radially displaced from the inner frusto-conicalsurface on said flared edge portion and with said die block structurehaving an annular flat surface at the base of the frustoconical surfacethereon terminating in a cutting edge, and then forcing a forming ringalong the outside of the body of the embryo cup with an ing said flaredportion to to force the metal thereof against said frustoconical surfaceand the flat surface on said dieblock structure and with the cuttingedge on said ring finally cooperating with the cutting edge at the endof the fiat surface on said die-block structure to shear off surplusmetalfrom said flared portion and to produce the finished cup. HENRY H.HUBBARD.

